Mixed Fish Lasagne

[lidlicker]

Many years ago I made a fish lasagne with smoked haddock,cod and salmon. I can't quite remember the recipe, can anyone help please?
I know there was onion and white sauce and cheese.
I have just made a recipe found on the internet with two cans of chopped
tomatoes in it and it just drowned the flavour of the fish.
Many thanks in advance.

[Buenchico]

Not a tomato (canned or otherwise) in sight:
http://www.bbc.co.uk/food/recipes/seafoodlasagne_89170

[lidlicker]

Thanks for that Buenchico - I will give it a try, no onions though !